Your fish seems to have some interesting spots on its belly. I wonder if a little experimentation couldn't bring out the detail a little better. These guys don't move so much so you'll have plenty of time, IIRC.

i still have to learn to use photoshop properly, but those spots are pretty pale on his belly. the really nice spots are on the other side.
Believe it or not this fish doesn't stay still long for good shots. he's very skitterish

looks like Spike, my Male Ancistrus has a brother out there although he is a bit of a show off and will stay still for hours on end... here is a couple of the pics I took yesterday, mind you this was taken with a sad 1.3MP digi cam, so I am pretty happy with the final product....